[zen-49] Correct import statements across framework

- Ran a script that would create multiple import statements out of multi-line
  import statements, and which would sort all import statements in alphabetic
  order. Script is at https://gist.github.com/3079222 and was run by dropping
  into the library/Zend folder and typing (in zsh)
  "for file in **/*.php;do php /path/to/replace-uses.php $file; done"

src/Request/Http.php

@@ -10,8 +10,8 @@
 
 namespace Zend\XmlRpc\Request;
 
-use Zend\XmlRpc\Request as XmlRpcRequest;
 use Zend\XmlRpc\Fault;
+use Zend\XmlRpc\Request as XmlRpcRequest;
 
 /**
  * XmlRpc Request object -- Request via HTTP